About: http://webisa.webdatacommons.org/64186372

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Since it is telling you at run time that the value of the list reference variable is null, then it must be that it was declared somewhere that the compiler knows about it, but was never given a value to make it something other than null.
http://www.w3.org/ns/prov#wasQuotedFrom	javaprogrammingforums.com